/*
 * Copyright 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.android.material.animation;

import static com.google.common.truth.Truth.assertThat;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.annotation.internal.DoNotInstrument;

/** Tests for {@link AnimationUtils}. */
@RunWith(RobolectricTestRunner.class)
@DoNotInstrument
public class AnimationUtilsTest {

  @Test
  public void testLerp_spansPositiveAndNegativeRange() {
    assertThat(AnimationUtils.lerp(-100F, 100F, 0F, 1F, .5F)).isEqualTo(0F);
    assertThat(AnimationUtils.lerp(0F, 100F, -100F, 100F, 0F)).isEqualTo(50F);
    assertThat(AnimationUtils.lerp(-200F, -100F, 100F, 200F, 150F)).isEqualTo(-150F);
    assertThat(AnimationUtils.lerp(0F, 1F, -200F, -100F, -150F)).isEqualTo(.5F);
  }
}
